CVE-2020-13246: Github.com/go gitea/gitea Denial of Service Vulnerability

HIGH
Advisory Identifier: GHSA-g2qx-6ghw-67hm
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CVSS 7.5
CWE-667
Published
Advisory Summary

CVE-2020-13246 is a HIGH (CVSS 7.5) denial of service vulnerability (CWE-667: Improper Locking) affecting Github.com/go gitea/gitea libraries in the Go ecosystem. The issue involves denial of service in gitea. Remediation is available by upgrading affected packages to version 1.12.0.

CVE-2020-13246 at a Glance

CVE Identifier CVE-2020-13246
GHSA Identifier GHSA-g2qx-6ghw-67hm
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-667: Improper Locking
Affected Product Github.com/go gitea/gitea
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2020-13246

To remediate this vulnerability, upgrade all affected Github.com/go gitea/gitea dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/go-gitea/gitea fixed: 1.12.0 
Upgrade github.com/go-gitea/gitea to 1.12.0
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/go-gitea/gitea

How to Check if You Are Affected

To determine whether your application is affected by CVE-2020-13246, inspect your project dependencies for Github.com/go gitea/gitea:

inspect dependencies for github.com/go-gitea/gitea

Analyze the terminal output to locate any version of Github.com/go gitea/gitea in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 1.12.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-667: Improper Locking, where the product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors. In Github.com/go gitea/gitea, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

An issue was discovered in Gitea in which an attacker can trigger a deadlock by initiating a transfer of a repository's ownership from one organization to another.

CVE-2020-13246 Affected Github.com/go gitea/gitea Versions

1 component(s)
Fixed Versions:
1.12.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/go-gitea/gitea
golang/github.com/go-gitea/gitea
Go
< 1.12.0
1.12.0

References

NVD — CVE-2020-13246 NVD
https://nvd.nist.gov/vuln/detail/CVE-2020-13246
Github.com/go gitea/gitea Source Repository REPOSITORY
https://github.com/go-gitea/gitea/issues/10549
Github.com/go gitea/gitea Source Repository REPOSITORY
https://github.com/go-gitea/gitea/pull/11438
www.youtube.com/watch WEB
https://www.youtube.com/watch?v=DmVgADSVS88

Frequently Asked Questions

What is CVE-2020-13246?
CVE-2020-13246 is a security vulnerability in Github.com/go gitea/gitea involving Denial of Service in Gitea under CWE-667: Improper Locking.
Which Github.com/go gitea/gitea versions are affected?
Affected versions include releases prior to 1.12.0 across affected packages: github.com/go-gitea/gitea.
What version fixes CVE-2020-13246?
Upgrading to 1.12.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/go-gitea/gitea affected?
Yes, github.com/go-gitea/gitea is affected in releases prior to 1.12.0. Upgrade your dependency to 1.12.0 or later.
What is the CVSS score of CVE-2020-13246?
CVE-2020-13246 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2020-13246?
CVE-2020-13246 is classified under CWE-667: Improper Locking (The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors.).
How can I check Go dependencies for CVE-2020-13246?
Run the dependency tree command: 'inspect dependencies for github.com/go-gitea/gitea'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-g2qx-6ghw-67hm",
  "modified" : "2021-05-20T22:20:34Z",
  "published" : "2022-02-15T00:33:30Z",
  "aliases" : [ "CVE-2020-13246" ],
  "summary" : "Denial of Service in Gitea",
  "details" : "An issue was discovered in Gitea in which an attacker can trigger a deadlock by initiating a transfer of a repository's ownership from one organization to another.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/go-gitea/gitea"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "1.12.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2020-13246"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/issues/10549"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/go-gitea/gitea/pull/11438"
  }, {
    "type" : "WEB",
    "url" : "https://www.youtube.com/watch?v=DmVgADSVS88"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-667" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2021-05-20T22:20:34Z",
    "nvd_published_at" : null
  }
}